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Petrophytum
''Petrophytum'' ( orth. var. ''Petrophyton'') is a small genus of plants in the rose family known as the rock spiraeas or rockmats. These are low mat-forming shrubs which send up erect stems bearing spike inflorescences of flowers. The brushy flowers are white and have many stamens and hairy, thready pistil Gynoecium (; ) is most commonly used as a collective term for the parts of a flower that produce ovules and ultimately develop into the fruit and seeds. The gynoecium is the innermost whorl of a flower; it consists of (one or more) ''pistils'' ...s. Rockmats are native to western North America. Species: *'' Petrophytum caespitosum'' — mat rock spiraea *'' Petrophytum cinerascens'' — halfshrub rockmat, Chelan rockmat *'' Petrophytum hendersonii'' — Olympic Mountain rockmat References External linksJepson Manual Treatment [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrophytum Cinerascens
''Petrophytum cinerascens'' ( orth. var. ''Petrophyton cinerascens'') is a rare species of flowering plant in the rose family known by the common names halfshrub rockmat and Chelan rockmat. It is endemic to the state of Washington in the United States, where it occurs in just a few locations along the Columbia River in Chelan and Douglas Counties. Description ''Petrophytum cinerascens'' is a mat-forming perennial herb growing in cracks and crevices in riverside cliffs. The stems are up to long, arising from the mat of leaves. The stems bear racemes long of white flowers with many stamens. Blooming occurs in June through September. Conservation There are five occurrences of this plant all in a 27-kilometer stretch of cliffs along the Columbia River in central Washington. Two of the occurrences have about 1000 individuals each; the other three have fewer. The plant is threatened by quarrying of rock nearby. Other threats include highway maintenance, introduced species of pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrophytum Hendersonii
''Petrophytum'' ( orth. var. ''Petrophyton'') is a small genus of plants in the rose family known as the rock spiraeas or rockmats. These are low mat-forming shrubs which send up erect stems bearing spike inflorescences of flowers. The brushy flowers are white and have many stamens and hairy, thready pistils. Rockmats are native to western North America. Species: *'' Petrophytum caespitosum'' — mat rock spiraea *''Petrophytum cinerascens ''Petrophytum cinerascens'' ( orth. var. ''Petrophyton cinerascens'') is a rare species of flowering plant in the rose family known by the common names halfshrub rockmat and Chelan rockmat. It is endemic to the state of Washington in the United S ...'' — halfshrub rockmat, Chelan rockmat *'' Petrophytum hendersonii'' — Olympic Mountain rockmat References External linksJepson Manual Treatment [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrophytum
''Petrophytum'' ( orth. var. ''Petrophyton'') is a small genus of plants in the rose family known as the rock spiraeas or rockmats. These are low mat-forming shrubs which send up erect stems bearing spike inflorescences of flowers. The brushy flowers are white and have many stamens and hairy, thready pistil Gynoecium (; ) is most commonly used as a collective term for the parts of a flower that produce ovules and ultimately develop into the fruit and seeds. The gynoecium is the innermost whorl of a flower; it consists of (one or more) ''pistils'' ...s. Rockmats are native to western North America. Species: *'' Petrophytum caespitosum'' — mat rock spiraea *'' Petrophytum cinerascens'' — halfshrub rockmat, Chelan rockmat *'' Petrophytum hendersonii'' — Olympic Mountain rockmat References External linksJepson Manual Treatment [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrophytum Caespitosum
''Petrophytum caespitosum'' ( ''Petrophyton caespitosum'') is a woody perennial species of flowering plant in the rose family known by the common name mat rock spiraea and native to western United States. Range and Habitat ''Petrophytum caespitosum'' is native to the Western United States where it grows in mountainous areas from the Sierra Nevada to the Rocky Mountains. It grows among limestone rocks in forested and woodland habitat and on open limestone bluffs and cliffs. Description ''Petrophytum caespitosum'' is a very low matted shrub growing in carpets up to 80 centimeters wide, creeping over rocks. The plant often grows on vertical surfaces and hangs by its roots, which cling to cracks in rock. The stems are thick and very short, covered densely in rosettes of oval leaves. Both surfaces of the leaves are lightly covered in short fine hairs, which may not be obvious without close inspection. It produces many inflorescences which are spikelike clusters of flowers arising on e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Orthographical Variant
In biology, within the science of scientific nomenclature, i.e. the naming of organisms, an orthographical variant (abbreviated orth. var.) in botany or an orthographic error in zoology, is a spelling mistake, typing mistake or writing mistake within a scientific publication that resulted in a somewhat different name being accidentally used for an already-named organism. The rules that govern what to do when this happens are laid out in the relevant codes of nomenclature. In botanical names In botanical nomenclature, an orthographical variant (abbreviated orth. var.) is a variant spelling of the same name. For example, ''Hieronima'' and ''Hyeronima'' are orthographical variants of '' Hieronyma''. One of the spellings must be treated as the correct one.ICBNVienna Code(2006), Article 61 In this case, the spelling ''Hieronyma'' has been conserved and is to be used as the correct spelling. An inadvertent use of one of the other spellings has no consequence: the name is to be treate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rosaceae
Rosaceae (), the rose family, is a medium-sized family of flowering plants that includes 4,828 known species in 91 genera. The name is derived from the type genus ''Rosa''. Among the most species-rich genera are ''Alchemilla'' (270), ''Sorbus'' (260), '' Crataegus'' (260), ''Cotoneaster'' (260), ''Rubus'' (250), and ''Prunus'' (200), which contains the plums, cherries, peaches, apricots, and almonds. However, all of these numbers should be seen as estimates—much taxonomic work remains. The family Rosaceae includes herbs, shrubs, and trees. Most species are deciduous, but some are evergreen. They have a worldwide range but are most diverse in the Northern Hemisphere. Many economically important products come from the Rosaceae, including various edible fruits, such as apples, pears, quinces, apricots, plums, cherries, peaches, raspberries, blackberries, loquats, strawberries, rose hips, hawthorns, and almonds. The family also includes popular ornamental trees and shrubs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inflorescence
An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed on the axis of a plant. The modifications can involve the length and the nature of the internodes and the phyllotaxis, as well as variations in the proportions, compressions, swellings, adnations, connations and reduction of main and secondary axes. One can also define an inflorescence as the reproductive portion of a plant that bears a cluster of flowers in a specific pattern. The stem holding the whole inflorescence is called a peduncle. The major axis (incorrectly referred to as the main stem) above the peduncle bearing the flowers or secondary branches is called the rachis. The stalk of each flower in the inflorescence is called a pedicel. A flower that is not part of an inflorescence is called a solitary flower and its stalk is al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stamen
The stamen (plural ''stamina'' or ''stamens'') is the pollen-producing reproductive organ of a flower. Collectively the stamens form the androecium., p. 10 Morphology and terminology A stamen typically consists of a stalk called the filament and an anther which contains ''sporangium, microsporangia''. Most commonly anthers are two-lobed and are attached to the filament either at the base or in the middle area of the anther. The sterile tissue between the lobes is called the connective, an extension of the filament containing conducting strands. It can be seen as an extension on the dorsal side of the anther. A pollen grain develops from a microspore in the microsporangium and contains the male gametophyte. The stamens in a flower are collectively called the androecium. The androecium can consist of as few as one-half stamen (i.e. a single locule) as in ''Canna (plant), Canna'' species or as many as 3,482 stamens which have been counted in the saguaro (''Carnegiea gigantea'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carpel
Gynoecium (; ) is most commonly used as a collective term for the parts of a flower that produce ovules and ultimately develop into the fruit and seeds. The gynoecium is the innermost whorl of a flower; it consists of (one or more) ''pistils'' and is typically surrounded by the pollen-producing reproductive organs, the stamens, collectively called the androecium. The gynoecium is often referred to as the "female" portion of the flower, although rather than directly producing female gametes (i.e. egg cells), the gynoecium produces megaspores, each of which develops into a female gametophyte which then produces egg cells. The term gynoecium is also used by botanists to refer to a cluster of archegonia and any associated modified leaves or stems present on a gametophyte shoot in mosses, liverworts, and hornworts. The corresponding terms for the male parts of those plants are clusters of antheridia within the androecium. Flowers that bear a gynoecium but no stamens are called ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiraeeae
Spiraeeae is a tribe of the rose family, Rosaceae, belonging to the subfamily Amygdaloideae Amygdaloideae is a subfamily within the flowering plant family Rosaceae. It was formerly considered by some authors to be separate from Rosaceae, and the family names Prunaceae and Amygdalaceae have been used. Reanalysis from 2007 has shown that .... References External links Rosales tribes {{Amygdaloideae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
